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Thymoma : Type B1 (Lymphocyte-rich) : Starry Sky

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Comments:
An intermediate power view of Type B1 thymoma showing starry-sky appearance due to scattered tingible-body macrophages surrounded by densely packed non-neoplastic small lymphocytes. The epithelial component is inconspicuous at this magnification. Type B1 thymomas are more aggressive than type A and AB thymomas but have better prognosis than B2 and B3 thymomas and thymic carcinomas.

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